Lens



FIG. 1 is a perspective view of a lens in accordance with the present design.

FIG. 2 is a side, elevational view thereof, the right, left, front, and back elevational views being identical.

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

CLAIM The ornamental design for a lens, as shown and described. 